Let's address to results of our research and we shall supply with their brief accompanying comment! On turn � fans of a standard size mm! Spectrum not too indicative, but some features of noise Arctic Fan nevertheless are shown, and is quite evident. Splash in the field of the bottom frequencies is swept well up (strips of 2 Hz and 2 Hz) it is so-called characteristic frequency which is defined by a parity f = (RPM*n)/ where RPM turns, n the number of blades kry'l'chatki, and physically is a fundamental component of aerodynamic noise of the fan. gorbik a spectrum of a strip of 4 Hz and 5 Hz, it is possible to interpret the second as the second harmonic of characteristic frequency. One more emission a strip of 12 Hz, shodu to notebook toshiba driver explain uneasy. Our hypothesis this display of a crash of the motor, that electromechanical prizvuka which is generated by not smoothed switching of windings induktora It is significant the improved picture, in comparison with Arctic Fan 8. The basic acoustic energy here is concentrated in a low-frequency zone in the field of characteristic frequency (a strip of 1 Hz and 2 Hz). Further smooth, quite accurate spectrum. As the result, in subjective perception noise Arctic Fan 8L appears as superposition well muffled low-frequency prizvuka and a soft rustle of air Rather indicative spectrum. The main feature � very precisely outlined peak of characteristic frequency in a strip notebook toshiba driver of 1 Hz (excess of the "next" levels on 16- dB!). Subjectively this tone in noise is similar to cardinally muffled sound of the turbo-propeller aviation engine (original silent "rumble"). There is also the second harmonic of the basic tone precisely allocated in a strip 2 GC, and the third � 4 Hz "smeared" in strips, 5 Hz and 6 Hz (it is obvious, here is still imposed the turbulent noise arising in pair � kry'l'chatka � racks statora �. One more "peak" (a strip of 12 Hz) is � a crash of the motor � which in noise Tri-Blade TBF-B81-E is clearly listened. Again we observe prevalence of the aerodynamic noise "generated" by characteristic frequency, � precise peak in a strip notebook toshiba driver of 2 Hz, and also the second-third harmonics in strips of 5 Hz and 1kGc. Some rise in spectral "middle" (frequencies 1- kGc) which, apparently, is connected with shumovy'mi effects on racks statora is in addition allocated and seasoned by " a crash of the motor �. As one would expect, aerodynamic noise nizkooborotistoy kry'l'chatki SAF-S84-E1-GP equal enough special allocation of harmonics of characteristic frequency is not observed (there are insignificant splashes in strips of 1 Hz and 4 Hz). Meanwhile, on the muffled aerodynamic background already are quite appreciable electric prizvuki a cod of the motor (the first harmonic of a strip kGc and 1, kGc, the second 2, kGc) Very curious, in own way a unique spectrum. The main feature is the smeared aerodynamic noise which is scattered on three harmonics the first harmonic the third is stretched in strips of 2 Hz, 2 Hz and 3 notebook toshiba driver Hz, 4 Hz second in strips, 5 Hz and 6 Hz, in sector 1-2, kGc. As the reason for such behaviour serves dense crescent kry'l'chatka with high value solidity factor (1, at a nave and 1, on an external edge of the blade), a levelling tonality of characteristic frequency. As the result, equivalent noise at SilentBlade GT80252BDL- equal, without irritating prizvukov and with subjective prevalence of a mid-frequency rustle of air Here acoustic influence of fundamental frequency is expressed the basic splash in a strip of 1 Hz and the second harmonic in a strip of 3 Hz is more precisely observable. However the middle and tops look much more accurately, than at SilentBlade GT80252BDL-1, and rezul'tiruyusch'iy noise SilentBlade II GT8025-HDLA appears in subjective perception more ergonomic and smoothed. One more indicative, it is possible to tell � notebook toshiba driver an axiomatic spectrum. We see precise tone of characteristic frequency in a strip of 4 Hz (excess over "neighbours" more than dB), very high "middle" and high "tops" � that is, obvious acoustic attributes vy'sokooborotistoy kry'l'chatki with the direct blade. In the subjective attitude this picture turns around unpleasant, frightening we "howl" kry'l'chatki which is interfaced to loud "hissing" air. The picture in many respects repeats besides there is a characteristic tone (now 3 Hz displaced in a strip) and the raised levels at the middle and tops of a spectrum. Loudness howling kry'l'chatki subjectively goes down, however hissing of air is still perceived importunate enough As one would expect, on the moderate turns the situation more or less is normalized a characteristic tonality in spectrum TFD-8025L12S remains, but it is already less notebook toshiba driver expressed and scattered in two harmonics (strips of 2 Hz and 5 Hz). However the lowered middle starts to allocate a crash of the motor (a strip 1, kGc) which has been disguised at TFD-8025M12C and TFD-8025H12B by high equivalent noise level Interesting spectrum. Its main feature becomes occurrence of a subharmonic from characteristic frequency � except for fundamental peak (the strip of 3 Hz) is present also splash at a strip of 1 Hz (that is, approximately? Characteristic frequency). The nature of this "subharmonic" is not absolutely clear � apparently, its source can be any individual features of an aerodynamic configuration kry'l'chatki ZM-F (or structural noise of the notebook toshiba driver fan). The combination of lowered "middle" and accurate "tops" � a difference with Titan TFD-8025H12B, functioning on sravnimy'h turns, very much and very essential is rather curious also! So if to not consider an incident with "subharmonic" the tendency to shumoponijeniyu here is looked through precisely and clearly. And here business manages already any surprises is observable poorly expressed fundamental component (a strip of 2 Hz), almost imperceptible harmonic in a strip of 4 Hz, and also there is enough rovnen'kuyu the middle and tidy tops. As the result, in the subjective attitude noise calmed down ZM-F appears quite ergonomic and not importunate. Other discussions in conference:

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